Hmm... Seems like broken logic to me. It doesn't matter whether or not God knows why you made the choices in your life that you ended up making: If God knows what you will choose before you chose it, you are determined to choose it.
For example, you may finally be offered your dream job three days from now. God may not have any idea of why you will eventually choose to decline this job, but fact remains that he knew you would end up declining it before the universe was created. Same goes for every decision that every human has and will make during their lifetimes.
All decisions are determined (by God in this case since he created the universe as we know it despite knowing the outcome in perfect detail), and are thereby not free by default. It does not matter if God knows why they were made or not, as long as he is aware of the outcome.
